fix: 修复 trigger.operator null + 添加覆盖反馈重试 - Closes #22, Closes #21

#22: _normalize_rule 补充 trigger 级别 operator (AND/OR) 默认值
#21: step1 验证失败时自动生成覆盖反馈并重试一轮
#22: step2 过滤空规则片段，避免污染下游

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

skills/ir_generation_skill/step1_semantic_index.py

@@ -535,6 +535,20 @@ def _quick_validate(
     return passed, gaps
 
 
+def _build_coverage_feedback(gaps: dict) -> str:
+    """Generate feedback text for re-prompting when coverage is below threshold."""
+    lines = []
+    for item in gaps.get("missing_paths", []):
+        lines.append(f"- {item}")
+    if lines:
+        return (
+            "\n## 覆盖反馈（上一次运行未满足覆盖要求，请重新生成并修复以下缺口）\n\n"
+            + "\n".join(lines)
+            + "\n\n请重新审视文档，为缺失的章节和表格行创建对应的 function_unit。"
+        )
+    return ""
+
+
 def _collect_logic_tree_nodes(doc: dict) -> dict[str, dict[str, str]]:
     """Return {image_id: {node_id: node_type}} for all logic trees."""
     result = {}
@@ -750,6 +764,29 @@ def run_ensemble_semantic_index(doc: dict) -> dict:
             if v:
                 print(f"    {k}: {len(v)} 个问题")
 
+        # Feedback retry: re-run with coverage feedback (one retry)
+        feedback = _build_coverage_feedback(gaps)
+        if feedback:
+            print(f"\n  覆盖反馈重试...")
+            try:
+                retry_prompt = build_prompt(doc, feedback, all_paths)
+                retry_result = call_llm(retry_prompt, max_retries=1, temperature=0.0)
+                n_retry_units = len(retry_result.get("function_units", []))
+                print(f"  重试返回: {n_retry_units} 功能单元")
+                if n_retry_units > 0:
+                    # Merge retry into results and re-validate
+                    semantic_indices.append(retry_result)
+                    merged = ensemble_merge(semantic_indices)
+                    merged["ensemble_temperatures"] = list(temperatures) + ["feedback_retry"]
+                    passed, gaps = _quick_validate(merged, doc, all_paths)
+                    merged["validation_passed"] = passed
+                    merged["validation_gaps"] = {
+                        k: v for k, v in gaps.items() if v
+                    }
+                    print(f"  重试后验证: {'PASS' if passed else 'GAPS FOUND'}")
+            except Exception as e:
+                print(f"  覆盖反馈重试失败: {e}")
+
     return merged